:root{--ink:#132238;--muted:#607086;--bg:#f5f7fb;--card:#fff;--navy:#143a62;--blue:#2467a9;--green:#1c7c62;--amber:#b36b00;--red:#b83b3b;--line:#dfe5ed;--shadow:0 12px 36px rgba(17,35,58,.08);--radius:20px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans","PingFang SC","Microsoft YaHei",sans-serif}a{color:var(--blue)}button,a.btn{font:inherit}header{background:linear-gradient(135deg,#102f51,#1f5f91);color:#fff;padding:20px 0 72px}.wrap{width:min(1120px,calc(100% - 32px));margin:auto}.topbar{display:flex;justify-content:space-between;gap:16px;align-items:center}.brand{font-weight:800;letter-spacing:.02em}.lang{display:flex;gap:8px}.lang a{color:#fff;text-decoration:none;border:1px solid rgba(255,255,255,.35);padding:7px 11px;border-radius:999px}.hero{display:grid;grid-template-columns:1.3fr .7fr;gap:30px;align-items:end;padding-top:56px}.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:.76rem;font-weight:800;color:#b9d9f4}.hero h1{font-size:clamp(2.25rem,6vw,4.7rem);line-height:.98;margin:12px 0 18px;max-width:850px}.hero p{font-size:1.15rem;max-width:740px;color:#dceaf5}.hero-card{background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);backdrop-filter:blur(10px);padding:22px;border-radius:var(--radius)}.hero-card strong{font-size:2.2rem;display:block}.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:11px 15px;font-weight:750;cursor:pointer;text-decoration:none;background:var(--navy);color:#fff}.btn.light{background:#fff;color:var(--navy)}.btn.ghost{background:transparent;border:1px solid var(--line);color:var(--ink)}.btn.success{background:var(--green)}main{margin-top:-42px;padding-bottom:70px}.panel{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;margin-bottom:22px}.panel h2{margin:0 0 8px;font-size:1.65rem}.sub{color:var(--muted);margin-top:0}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.stat{padding:18px;border:1px solid var(--line);border-radius:16px;background:#fbfcfe}.stat b{display:block;font-size:1.65rem}.stat span{color:var(--muted);font-size:.9rem}.plan{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.day{border:1px solid var(--line);border-radius:16px;padding:16px;min-height:150px}.day .num{font-weight:900;color:var(--blue);font-size:.78rem;text-transform:uppercase}.day h3{margin:6px 0;font-size:1.03rem}.day p{margin:0;color:var(--muted);font-size:.92rem}.day.today{border-color:#8fc2eb;background:#f0f8ff}.lessons{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.lesson{border:1px solid var(--line);border-radius:18px;padding:18px;background:#fff}.lesson h3{margin:8px 0}.lesson p{color:var(--muted);font-size:.94rem}.tag{display:inline-block;font-size:.75rem;font-weight:800;padding:4px 9px;border-radius:999px;background:#eaf2f9;color:var(--navy)}.must{background:#fff6df;color:#7e5200}.listen{margin-top:8px;background:#edf4fb;color:var(--navy);border:0;border-radius:10px;padding:8px 10px;font-weight:750;cursor:pointer}.visual-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.visual{border:1px solid var(--line);border-radius:16px;padding:16px;text-align:center}.sign{width:72px;height:72px;margin:4px auto 12px;display:grid;place-items:center;font-weight:900;color:#fff}.oct{background:#c93232;clip-path:polygon(29% 0,71% 0,100% 29%,100% 71%,71% 100%,29% 100%,0 71%,0 29%)}.tri{background:#d13c37;clip-path:polygon(0 0,100% 0,50% 100%);padding-top:14px}.diamond{background:#e2ad2e;transform:rotate(45deg);border-radius:4px}.diamond span{transform:rotate(-45deg);color:#222}.circle{background:#f1d34a;border-radius:50%;color:#222}.pent{background:#f0c445;clip-path:polygon(50% 0,100% 38%,82% 100%,18% 100%,0 38%);color:#222}.pennant{background:#e8c33b;clip-path:polygon(0 10%,100% 50%,0 90%);color:#222}.rules{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.rule{padding:16px;border-radius:16px;background:#f8fafc;border:1px solid var(--line)}.rule b{font-size:1.25rem}.rule.red b{color:var(--red)}.rule.green b{color:var(--green)}.audio-box{display:grid;grid-template-columns:1fr auto;gap:20px;align-items:center;background:#102f51;color:#fff}.audio-box .sub{color:#c9dbea}.audio-controls{display:flex;gap:8px;flex-wrap:wrap}.audio-controls button{background:#fff;color:#163b62;border:0;border-radius:12px;padding:11px 14px;font-weight:800}.quiz-shell{display:grid;grid-template-columns:260px 1fr;gap:22px}.quiz-menu{border-right:1px solid var(--line);padding-right:20px}.quiz-menu button{width:100%;margin:5px 0}.quiz-card{min-height:330px}.qmeta{display:flex;justify-content:space-between;color:var(--muted);font-size:.9rem}.question{font-size:1.35rem;font-weight:800;margin:24px 0 16px}.answers{display:grid;gap:10px}.answer{border:1px solid var(--line);background:#fff;border-radius:14px;padding:13px 15px;text-align:left;cursor:pointer}.answer:hover{border-color:#8fbce1}.answer.correct{border-color:#4b9d83;background:#edf8f4}.answer.wrong{border-color:#d57c7c;background:#fff1f1}.explain{margin-top:16px;padding:14px;border-radius:12px;background:#f4f7fa;display:none}.progress{height:8px;background:#e6ebf1;border-radius:999px;overflow:hidden}.progress>div{height:100%;background:var(--green);width:0}.source-links{display:flex;flex-wrap:wrap;gap:10px}.notice{font-size:.88rem;color:var(--muted);border-top:1px solid var(--line);margin-top:18px;padding-top:14px}footer{padding:30px 0;color:var(--muted);text-align:center}.hidden{display:none!important}@media(max-width:900px){.hero{grid-template-columns:1fr}.stats,.plan{grid-template-columns:repeat(2,1fr)}.lessons,.rules{grid-template-columns:repeat(2,1fr)}.visual-grid{grid-template-columns:repeat(3,1fr)}.quiz-shell{grid-template-columns:1fr}.quiz-menu{border-right:0;border-bottom:1px solid var(--line);padding:0 0 16px}}@media(max-width:600px){.wrap{width:min(100% - 22px,1120px)}header{padding-bottom:62px}.hero{padding-top:40px}.stats,.plan,.lessons,.rules{grid-template-columns:1fr}.visual-grid{grid-template-columns:repeat(2,1fr)}.panel{padding:19px}.topbar{align-items:flex-start}.audio-box{grid-template-columns:1fr}.hero h1{font-size:2.65rem}}